Abstract: In order to improve the intensity of polyvinylidene fluoride(PVDF) microporous membrane,the support fabric was coated with casting solution and the polyvinylidene fluoride microporous membrane reinforced with fabric was prepared by phase inversion process.The factors influencing the preparation and the characters of composite membrane were discussed.The results show that the leakage of casting solution on fabric can be avoided in coating process by increasing the compactness of fabric,finishing the fabric with water and oil repellent or chitosan,and increasing the concentration of PVDF in casting solution,which is in favor of the preparation process of composite membrane.